Again it boils down to cost effectiveness.
After at least 6mths - 1yr, I would analyze where my #2 -5 top rankings for traffic and sales were coming from.
If Japan came in at number 2, then I would consider more options to cater to the Japanese. On what levels I would cater to them, would depend on how much traffic and sales the Japanese were producing.
It's all a matter of watching and analyzing your stats. It's a matter of understanding your stats and what niche(s) works for that particular chunk of traffic.
When you begin to translate your site into other languages, things can get a little tricky. For example, would you just change all your front end, including ads, and then leave one members area for all, or would you change the entire site including the members area? Would you need to have staff who can speak and read in the language(s) the site has been translated to for customer service and sales?
They are tough questions. Definitely not easy decisions. It would also depend on what business you are running. Another thing to consider is, if you change the site to other languages to get them through the front door, and then they discover the back end of the site, including customer service, was all in English, would that effect your sales and/or member retention?
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